It can be hard to keep up with guitarist Bill Frisell, who leads several bands, participates in plenty of one-off collaborations, and works in an increasing number of cross-disciplinary projects, such as the one that brings him to Symphony Center on Friday night: The Great Flood. Frisell has written a 75-minute suite for a film by Bill Morrison (Decasia) about the devastating 1927 flood of the Mississippi River that killed 246 people in seven states, affected 27,000 square miles, and did $400 million in damage; the havoc it wreaked upon agriculture was a leading cause of the subsequent Great Migration, which obviously had a great impact on the development of American music.